/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/SkeletalMeshModifiers/Public/SkinWeightModifier.h
Remove all weights below the given threshold value, on the given vertex. Influences that are pruned will no longer receive weight from normalization.
true if influences were removed, false otherwise
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Weights") bool PruneVertexWeights ( const int32 VertexID, const float WeightThreshold )